<html>
<head></head>
<body>
	<span wicket:id="feedback"/>
	<form wicket:id="f">
		<input type="text" wicket:id="num"/>
	</form>
	Result: <span wicket:id="r"></span>.
	<br>
	<a wicket:id="help">Help</a>
	<div wicket:id="helpContent">
	type an <b>int</b>, result will be displayed.
	</div>
</body>
</html>